Aconstruction worker is sent to the store to buy more than 30 lb of roofing nails. the nails are sold in 5 lb boxes and 10 lb boxes. the number of 5 lb boxes is represented by x, and the number of 10 lb boxes is represented by y. which inequality models this situation?
question 1 options:

a: 5x + 10y > 30
b: x + y ≥ 30
c: x + y > 30
d: 5x + 10y ≥ 30

The answer is A: 5x + 10y > 30. That is, the combination of boxes must be greater than 30 since the requirement is to have more than 30 lb of nails.

Step-by-step explanation:

The worker can buy a combination of boxes, as long as the total is greater than 30 lb. Multiply 5 lb by x and add that to 10 lb times y to get the total, which must exceed 30 lb.

2

step-by-step explanation:

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify